feat(inflekt): add shared name-matching utilities and case helpers

packages/inflekt/__tests__/matching.test.ts

@@ -0,0 +1,139 @@
+import {
+  normalizeName,
+  normalizeNameSingular,
+  fuzzyFindByName,
+  namesMatch,
+} from '../src';
+
+describe('normalizeName', () => {
+  it('should lowercase and strip underscores', () => {
+    expect(normalizeName('delivery_zone')).toBe('deliveryzone');
+    expect(normalizeName('DeliveryZone')).toBe('deliveryzone');
+    expect(normalizeName('deliveryZones')).toBe('deliveryzones');
+    expect(normalizeName('DELIVERY_ZONE')).toBe('deliveryzone');
+    expect(normalizeName('shipments')).toBe('shipments');
+    expect(normalizeName('Shipment')).toBe('shipment');
+  });
+});
+
+describe('normalizeNameSingular', () => {
+  it('should normalize and strip trailing s', () => {
+    expect(normalizeNameSingular('shipments')).toBe('shipment');
+    expect(normalizeNameSingular('routes')).toBe('route');
+    expect(normalizeNameSingular('deliveryZones')).toBe('deliveryzone');
+    expect(normalizeNameSingular('delivery_zones')).toBe('deliveryzone');
+  });
+
+  it('should not strip s from names that do not end in s', () => {
+    expect(normalizeNameSingular('DeliveryZone')).toBe('deliveryzone');
+    expect(normalizeNameSingular('Shipment')).toBe('shipment');
+    expect(normalizeNameSingular('Route')).toBe('route');
+  });
+});
+
+describe('fuzzyFindByName', () => {
+  const tables = [
+    { name: 'Shipment' },
+    { name: 'DeliveryZone' },
+    { name: 'Route' },
+    { name: 'DriverVehicleAssignment' },
+  ];
+
+  it('should match exact names', () => {
+    expect(fuzzyFindByName(tables, 'Shipment', (t) => t.name)).toEqual({
+      name: 'Shipment',
+    });
+    expect(fuzzyFindByName(tables, 'Route', (t) => t.name)).toEqual({
+      name: 'Route',
+    });
+  });
+
+  it('should match snake_case codec names to PascalCase table names', () => {
+    expect(fuzzyFindByName(tables, 'delivery_zone', (t) => t.name)).toEqual({
+      name: 'DeliveryZone',
+    });
+    expect(
+      fuzzyFindByName(tables, 'driver_vehicle_assignments', (t) => t.name),
+    ).toEqual({ name: 'DriverVehicleAssignment' });
+  });
+
+  it('should match plural camelCase codec names to PascalCase table names', () => {
+    expect(fuzzyFindByName(tables, 'shipments', (t) => t.name)).toEqual({
+      name: 'Shipment',
+    });
+    expect(fuzzyFindByName(tables, 'routes', (t) => t.name)).toEqual({
+      name: 'Route',
+    });
+    expect(
+      fuzzyFindByName(tables, 'driverVehicleAssignments', (t) => t.name),
+    ).toEqual({ name: 'DriverVehicleAssignment' });
+  });
+
+  it('should return undefined for no match', () => {
+    expect(fuzzyFindByName(tables, 'NonExistent', (t) => t.name)).toBeUndefined();
+    expect(fuzzyFindByName(tables, 'zzz', (t) => t.name)).toBeUndefined();
+  });
+
+  it('should prefer exact match over fuzzy match', () => {
+    const items = [{ name: 'routes' }, { name: 'Route' }];
+    expect(fuzzyFindByName(items, 'routes', (t) => t.name)).toEqual({
+      name: 'routes',
+    });
+    expect(fuzzyFindByName(items, 'Route', (t) => t.name)).toEqual({
+      name: 'Route',
+    });
+  });
+});
+
+describe('namesMatch', () => {
+  it('should match identical names', () => {
+    expect(namesMatch('Shipment', 'Shipment')).toBe(true);
+  });
+
+  it('should match case-insensitive names', () => {
+    expect(namesMatch('shipment', 'Shipment')).toBe(true);
+    expect(namesMatch('ROUTE', 'route')).toBe(true);
+  });
+
+  it('should match snake_case to PascalCase', () => {
+    expect(namesMatch('delivery_zone', 'DeliveryZone')).toBe(true);
+  });
+
+  it('should match plural to singular', () => {
+    expect(namesMatch('shipments', 'Shipment')).toBe(true);
+    expect(namesMatch('routes', 'Route')).toBe(true);
+  });
+
+  it('should not match unrelated names', () => {
+    expect(namesMatch('User', 'Post')).toBe(false);
+    expect(namesMatch('Route', 'DeliveryZone')).toBe(false);
+  });
+});
+
+describe('case helpers: toCamelCase, toPascalCase, toScreamingSnake', () => {
+  // Import from index to verify they're exported
+  const {
+    toCamelCase,
+    toPascalCase,
+    toScreamingSnake,
+  } = require('../src');
+
+  it('toCamelCase should convert hyphenated and underscored strings', () => {
+    expect(toCamelCase('user-profile')).toBe('userProfile');
+    expect(toCamelCase('user_profile')).toBe('userProfile');
+    expect(toCamelCase('UserProfile')).toBe('userProfile');
+    expect(toCamelCase('some-long-name')).toBe('someLongName');
+  });
+
+  it('toPascalCase should convert hyphenated and underscored strings', () => {
+    expect(toPascalCase('user-profile')).toBe('UserProfile');
+    expect(toPascalCase('user_profile')).toBe('UserProfile');
+    expect(toPascalCase('userProfile')).toBe('UserProfile');
+  });
+
+  it('toScreamingSnake should convert camelCase and PascalCase', () => {
+    expect(toScreamingSnake('userProfile')).toBe('USER_PROFILE');
+    expect(toScreamingSnake('UserProfile')).toBe('USER_PROFILE');
+    expect(toScreamingSnake('displayName')).toBe('DISPLAY_NAME');
+  });
+});

packages/inflekt/package.json

@@ -1,6 +1,6 @@
 {
   "name": "inflekt",
-  "version": "0.3.3",
+  "version": "0.4.0",
   "description": "Inflection utilities for pluralization and singularization with PostGraphile-compatible Latin suffix handling",
   "author": "Constructive <developers@constructive.io>",
   "homepage": "https://github.com/constructive-io/dev-utils",

packages/inflekt/src/case.ts

@@ -57,3 +57,41 @@ export function underscore(str: string): string {
     .replace(/^_/, '')
     .toLowerCase();
 }
+
+/**
+ * Convert a hyphenated or underscored string to camelCase.
+ * Unlike `camelize`, this also handles hyphens and preserves
+ * camelCase boundaries that are already present.
+ * @example toCamelCase('user-profile') -> 'userProfile'
+ * @example toCamelCase('user_profile') -> 'userProfile'
+ */
+export function toCamelCase(str: string): string {
+  return str
+    .replace(/[-_](.)/g, (_, char) => char.toUpperCase())
+    .replace(/^(.)/, (_, char) => char.toLowerCase());
+}
+
+/**
+ * Convert a hyphenated or underscored string to PascalCase.
+ * Unlike `camelize`, this also handles hyphens.
+ * @example toPascalCase('user-profile') -> 'UserProfile'
+ * @example toPascalCase('user_profile') -> 'UserProfile'
+ */
+export function toPascalCase(str: string): string {
+  return str
+    .replace(/[-_](.)/g, (_, char) => char.toUpperCase())
+    .replace(/^(.)/, (_, char) => char.toUpperCase());
+}
+
+/**
+ * Convert a camelCase or PascalCase string to SCREAMING_SNAKE_CASE.
+ * @example toScreamingSnake('userProfile') -> 'USER_PROFILE'
+ * @example toScreamingSnake('UserProfile') -> 'USER_PROFILE'
+ */
+export function toScreamingSnake(str: string): string {
+  return str
+    .replace(/([A-Z])/g, '_$1')
+    .replace(/[-\s]/g, '_')
+    .toUpperCase()
+    .replace(/^_/, '');
+}

packages/inflekt/src/index.ts

@@ -8,4 +8,5 @@
 export * from './pluralize';
 export * from './case';
 export * from './naming';
+export * from './matching';
 export * from './transform-keys';

packages/inflekt/src/matching.ts

@@ -0,0 +1,95 @@
+/**
+ * Name matching utilities for resolving PostGraphile v5 naming mismatches.
+ *
+ * PostGraphile v5 uses different inflection conventions in different contexts:
+ *   - Table types are PascalCase (e.g., "Shipment", "DeliveryZone")
+ *   - Relation codec names are raw snake_case or camelCase (e.g., "shipments", "deliveryZones")
+ *
+ * These helpers provide a single, shared way to normalize and compare names
+ * across those boundaries instead of duplicating fuzzy-match logic in every consumer.
+ */
+
+/**
+ * Normalize a name for case-insensitive, delimiter-insensitive comparison.
+ * Strips underscores and lowercases.
+ *
+ * @example normalizeName("delivery_zone") // "deliveryzone"
+ * @example normalizeName("DeliveryZone")  // "deliveryzone"
+ * @example normalizeName("deliveryZones") // "deliveryzones"
+ */
+export function normalizeName(name: string): string {
+  return name.toLowerCase().replace(/_/g, '');
+}
+
+/**
+ * Normalize a name to its singular base form for comparison.
+ * Strips underscores, lowercases, and removes a trailing 's' when present.
+ *
+ * @example normalizeNameSingular("shipments")    // "shipment"
+ * @example normalizeNameSingular("DeliveryZone") // "deliveryzone"
+ * @example normalizeNameSingular("routes")       // "route"
+ */
+export function normalizeNameSingular(name: string): string {
+  const normalized = normalizeName(name);
+  return normalized.endsWith('s') ? normalized.slice(0, -1) : normalized;
+}
+
+/**
+ * Find a matching item by name using exact match first, then fuzzy
+ * case-insensitive / plural-insensitive fallback.
+ *
+ * This is the single shared implementation for resolving relation target names
+ * to table definitions, replacing ad-hoc fuzzy matching scattered across consumers.
+ *
+ * @param items      - Array of items to search through
+ * @param targetName - The name to find (may be PascalCase, snake_case, plural, etc.)
+ * @param getName    - Accessor to extract the comparable name from each item
+ * @returns The matched item, or undefined if no match found
+ *
+ * @example
+ * // Find a table by its relation target name
+ * const table = fuzzyFindByName(allTables, "shipments", t => t.name);
+ * // Matches Table with name "Shipment"
+ *
+ * @example
+ * // Works with snake_case codec names too
+ * const table = fuzzyFindByName(allTables, "delivery_zone", t => t.name);
+ * // Matches Table with name "DeliveryZone"
+ */
+export function fuzzyFindByName<T>(
+  items: T[],
+  targetName: string,
+  getName: (item: T) => string,
+): T | undefined {
+  // 1. Exact match (fast path)
+  const exact = items.find((item) => getName(item) === targetName);
+  if (exact) return exact;
+
+  // 2. Fuzzy match: case-insensitive, strip underscores, optional trailing 's'
+  const targetNormalized = normalizeName(targetName);
+  const targetBase = normalizeNameSingular(targetName);
+
+  return items.find((item) => {
+    const itemNormalized = normalizeName(getName(item));
+    return itemNormalized === targetNormalized || itemNormalized === targetBase;
+  });
+}
+
+/**
+ * Check whether two names refer to the same entity, ignoring case,
+ * underscores, and singular/plural differences.
+ *
+ * @example namesMatch("shipments", "Shipment")       // true
+ * @example namesMatch("delivery_zone", "DeliveryZone") // true
+ * @example namesMatch("Route", "routes")               // true
+ * @example namesMatch("User", "Post")                  // false
+ */
+export function namesMatch(a: string, b: string): boolean {
+  if (a === b) return true;
+  const aNorm = normalizeName(a);
+  const bNorm = normalizeName(b);
+  if (aNorm === bNorm) return true;
+  const aBase = normalizeNameSingular(a);
+  const bBase = normalizeNameSingular(b);
+  return aBase === bBase;
+}